CN107265777A - A kind of processing method to percolate film-filter concentration liquid - Google Patents
A kind of processing method to percolate film-filter concentration liquid Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F9/00—Multistage treatment of water, waste water or sewage
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- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/54—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using organic material
- C02F1/56—Macromolecular compounds
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/66—Treatment of water, waste water, or sewage by neutralisation; pH adjustment
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
- C02F1/722—Oxidation by peroxides
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- C02F2101/00—Nature of the contaminant
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- C02F2101/16—Nitrogen compounds, e.g. ammonia
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- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2301/00—General aspects of water treatment
- C02F2301/08—Multistage treatments, e.g. repetition of the same process step under different conditions
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- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2305/00—Use of specific compounds during water treatment
- C02F2305/02—Specific form of oxidant
- C02F2305/026—Fenton's reagent
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Abstract
The present invention provides a kind of processing method to percolate film-filter concentration liquid, comprises the following steps：One-level Fenton's reaction；Limewash and sodium hydroxide solution precipitation；BAF processing units are handled；Two grades of Fenton's reactions and PAM precipitations.A kind of processing method to percolate film-filter concentration liquid that the present invention is provided has advantages below：Percolate film-filter concentration liquid can be handled with high efficiency, low cost, it is ensured that water outlet indices meet discharge standard.
Description
Technical field
The invention belongs to technical field of waste treatment, and in particular to a kind of processing side to percolate film-filter concentration liquid
Method.
Background technology
Because percolate from garbage filling field film-filter concentration liquid biodegradability is poor, salinity is high, and content of beary metal is high, intractability
It is very big, typically now disregard, directly by the way of recharge, and long-term recharge will cause salinity and hardly degraded organic substance
Accumulation, reduces the biodegradability of percolate, increases intractability, reduces the permeant flux of film, therefore, how effectively rubbish to be oozed
Filtrate film-filter concentration liquid is handled, and is thing in the urgent need to address at present.
The content of the invention
The defect existed for prior art, the present invention provides a kind of processing side to percolate film-filter concentration liquid
Method, can effectively solve the above problems.
The technical solution adopted by the present invention is as follows：
The present invention provides a kind of processing method to percolate film-filter concentration liquid, comprises the following steps：
Step 1, for needing processed percolate film-filter concentration liquid, under stirring, mass fraction is used for 10%
Dilution heat of sulfuric acid regulation concentrate pH to 4-5.5；
Step 2, one-level Fenton's reaction, including：Regulation pH after concentrate flow to Fenton oxidation pond, under stirring, first to
Fenton oxidation pond adds ferrous sulfate heptahydrate, and its chemical feeding quantity is：1g concentrates COD adds 0.005-0.02mol/L Fe2+；
After the completion of ferrous sulfate heptahydrate is added, H is added2O2, its chemical feeding quantity is：1g concentrates COD adds 0.02-0.04mol H2O2；
Then, stirring reaction 2-4h；
Step 3, the concentrate after one-level Fenton's reaction, its PH is acidity, adds 100g/L limewash by concentrate
PH coarse adjustment is to 10.5 to 11；Then, 100g/L sodium hydroxide solutions are added, concentrate PH is fine-tuning to 12, makes heavy metal ion
Precipitate in the basic conditions, after precipitation separation, take supernatant；
Step 4, supernatant again with mass fraction for 10% dilution heat of sulfuric acid regulation PH to 7-8.5, then, from lower
On, use up flow type to pass through anoxic BAF processing units with 1-3m/h filtering velocitys；Filtrate used in anoxic BAF processing units is haydite, grain
Footpath 3-5mm；Sewage after anoxic BAF processing unit processes uses up flow type through intermediate pool, and it is good to be passed through with 1-3m/h filtering velocitys
Oxygen BAF processing units；Wherein, filtrate used in aerobic BAF processing units is haydite, and particle diameter 3-5mm, Aerobic Pond aeration tube and gas are anti-
Wash pipe to be separately provided, aeration uses air diffuser with sing-hole membranes, is arranged on cobble supporting layer, the position under ceramic grain filter
Put；Aerobic BAF processing units water part is back to the water inlet end of anoxic BAF processing units, and reflux ratio is 150%-700%；
Aerobic BAF processing units individually set intake pump；The water inlet end of anoxic BAF processing units, which is set, can add the delivery pump of carbon source,
When carbon source is not enough, Additional carbon sources are added；
Step 5, in the BAF processing through step 4, removal sewage after COD, ammonia nitrogen and total nitrogen, Fenton oxidation pond is flowed to, is carried out
Two grades of Fenton's reactions；Wherein, the process of two grades of Fenton's reactions is：Under stirring, seven water sulfuric acid are added simultaneously to Fenton oxidation pond sub-
Iron and H2O2；Wherein, 1g concentrates COD adds 0.005-0.02mol/L Fe2+；1g concentrates COD adds 0.02-0.04mol
H2O2；Stirring reaction 2-4h；
Step 6, the concentrate after two grades of Fenton's reactions, its PH is acidity, using 100g/L sodium hydroxide solutions, will
Concentrate PH is transferred to 7-8；Then, PAM is added, after precipitation separation, supernatant indices meet discharge standard, discharge.
It is preferred that, in step 2, ferrous sulfate heptahydrate adds speed and is：0.2-0.5ml/min；H2O2Adding speed is：3-
4ml/min。
It is preferred that, in step 3, limewash adds speed and is：1.0-2.0ml/min；Sodium hydroxide solution adds speed：
0.2-0.5ml/min。
It is preferred that, in step 5, ferrous sulfate heptahydrate and H2O2The speed that adds be：2-3ml/min.
A kind of processing method to percolate film-filter concentration liquid that the present invention is provided has advantages below：
Percolate film-filter concentration liquid can be handled with high efficiency, low cost, it is ensured that water outlet indices meet row
Put standard.
Brief description of the drawings
A kind of schematic flow sheet for processing method to percolate film-filter concentration liquid that Fig. 1 provides for the present invention.
Embodiment
In order that technical problem solved by the invention, technical scheme and beneficial effect are more clearly understood, below in conjunction with
Drawings and Examples, the present invention will be described in further detail.It should be appreciated that specific embodiment described herein is only used to
The present invention is explained, is not intended to limit the present invention.
The present invention provides a kind of processing method to percolate film-filter concentration liquid, with reference to Fig. 1, comprises the following steps：
Step 1, for needing processed percolate film-filter concentration liquid, under stirring, mass fraction is used for 10%
Dilution heat of sulfuric acid regulation concentrate pH to 4-5.5；
Step 2, one-level Fenton's reaction, including：Regulation pH after concentrate flow to Fenton oxidation pond, under stirring, first to
Fenton oxidation pond adds ferrous sulfate heptahydrate, and its chemical feeding quantity is：1g concentrates COD adds 0.005-0.02mol/L Fe2+；
After the completion of ferrous sulfate heptahydrate is added, H is added2O2, its chemical feeding quantity is：1g concentrates COD adds 0.02-0.04mol H2O2；
Then, stirring reaction 2-4h；
Fenton's reaction is one kind of advanced oxidation processes, and the strong oxygen for the free hydroxyl that hydrogen peroxide is produced is catalyzed using ferrous ion
The property changed, by the larger molecular organicses of difficult degradation be converted into degradable small organic molecule or permineralization be carbon dioxide and
Water, the ferric ion that simultaneous reactions are produced is good flocculant, and flocculation adsorption can also remove a part of pollutant, so
Fenton has good clearance to COD and colourity.
In this step, found through inventor's lot of experiments, when carrying out one-level Fenton's reaction, for percolate membrane filtration
Concentrate, adds ferrous sulfate heptahydrate and H2O2Speed, dosage and order of adding, the row that can influence final process to arrive
The indices of tapping.Technique described by this step, can significantly improve the performance for the relief liquor that final process is arrived.It is specific real
Data are tested referring to test example below.
In addition, because chemical feeding quantity is big during one-level Fenton's reaction, first plus ferrous sulfate, then add hydrogen peroxide, it is also ensured that medicine
The utilization ratio of agent.
Step 3, the concentrate after one-level Fenton's reaction, its PH is acidity, adds 100g/L limewash by concentrate
PH coarse adjustment is to 10.5 to 11；Then, 100g/L sodium hydroxide solutions are added, concentrate PH is fine-tuning to 12, makes heavy metal ion
Precipitate in the basic conditions, after precipitation separation, take supernatant；
Contain contents of many kinds of heavy metal ion inside the concentrate of refuse landfill, this step using the coarse adjustment of feeding lime water it is high its
PH, makes heavy metal ion precipitate in the basic conditions, is removed from water.By feeding lime water, heavy metal ion can be improved and sunk
Shallow lake clearance.Then, sodium hydroxide solution fine setting PH is reused, further realizes that heavy metal ion precipitation is complete.
Step 4, supernatant again with mass fraction for 10% dilution heat of sulfuric acid regulation PH to 7-8.5, then, from lower
On, use up flow type to pass through anoxic BAF processing units with 1-3m/h filtering velocitys；Filtrate used in anoxic BAF processing units is haydite, grain
Footpath 3-5mm；Sewage after anoxic BAF processing unit processes uses up flow type through intermediate pool, and it is good to be passed through with 1-3m/h filtering velocitys
Oxygen BAF processing units；Wherein, filtrate used in aerobic BAF processing units is haydite, and particle diameter 3-5mm, Aerobic Pond aeration tube and gas are anti-
Wash pipe to be separately provided, aeration uses air diffuser with sing-hole membranes, is arranged on cobble supporting layer, the position under ceramic grain filter
Put；Aerobic BAF processing units water part is back to the water inlet end of anoxic BAF processing units, and reflux ratio is 150%-700%；
Aerobic BAF processing units individually set intake pump；The water inlet end of anoxic BAF processing units, which is set, can add the delivery pump of carbon source,
When carbon source is not enough, Additional carbon sources are added；
BAF is one kind of biomembrance process, due to using uniform Ball-type packing, and only the growth of microorganism is not provided
Huge growing surface, while having filtration, there is splendid removal effect to COD, ammonia nitrogen, SS, a removal to ammonia nitrogen
Rate is more than 90%, and cooperation adds carbon source, and more than 70% is also can reach to the clearance of total nitrogen.At the anoxic BAF of series connection
Unit and aerobic BAF processing units are managed, also, anoxic BAF processing units are preceding, it is possible to use and the carbon source in water inlet carries out anti-nitre
Change, reduce additional carbon, reduce processing cost.
Step 5, in the BAF processing through step 4, removal sewage after COD, ammonia nitrogen and total nitrogen, Fenton oxidation pond is flowed to, is carried out
Two grades of Fenton's reactions；Wherein, the process of two grades of Fenton's reactions is：Under stirring, seven water sulfuric acid are added simultaneously to Fenton oxidation pond sub-
Iron and H2O2；Wherein, 1g concentrates COD adds 0.005-0.02mol/L Fe2+；1g concentrates COD adds 0.02-0.04mol
H2O2；Stirring reaction 2-4h；
Step 6, the concentrate after two grades of Fenton's reactions, its PH is acidity, using 100g/L sodium hydroxide solutions, will
Concentrate PH is transferred to 7-8；Then, PAM is added, after precipitation separation, supernatant indices meet discharge standard, discharge.
Most of colourity and about 70% COD can be removed by one-level Fenton's reaction, and improve its biodegradability, one-level
After Fenton's reaction, it is 11-12 to adjust PH by feeding lime water and sodium hydroxide solution, makes heavy metal ion precipitation from water
Remove, then water outlet PH is adjusted to 7-9, preposition anoxic is used subsequently into BAF, BAF, while removing ammonia to the backflow of Aerobic Pond nitrification liquid
Nitrogen and total nitrogen, this link is to COD clearance about 80%, and ammonia nitrogen and total nitrogen are down to below discharge standard, but water outlet COD is still difficult to
It is up to standard, carry out a Fenton's reaction again to its water outlet, remove remaining COD, the concentrate handled by above link, then with 3
Film production water mixing again, can meet COD concentration less than 100mg/L, BOD5Less than 30mg/L, ammonia nitrogen concentration is less than 25mg/L,
Total nitrogen concentration is less than 40mg/L emission request.
Embodiment one：
Step 1, for needing processed percolate film-filter concentration liquid, under stirring, mass fraction is used for 10%
Dilution heat of sulfuric acid regulation concentrate pH to 4；
Step 2, one-level Fenton's reaction, including：Regulation pH after concentrate flow to Fenton oxidation pond, under stirring, first to
Fenton oxidation pond adds ferrous sulfate heptahydrate, and its chemical feeding quantity is：1g concentrates COD adds 0.005-0.02mol/L Fe2+；
After the completion of ferrous sulfate heptahydrate is added, H is added2O2, its chemical feeding quantity is：1g concentrates COD adds 0.02-0.04mol H2O2；
Then, stirring reaction 2-4h；Wherein, ferrous sulfate heptahydrate adds speed and is：0.2ml/min；H2O2Adding speed is：4ml/
min。
Step 3, the concentrate after one-level Fenton's reaction, its PH is acidity, adds 100g/L limewash by concentrate
PH coarse adjustment is to 10.5；Then, 100g/L sodium hydroxide solutions are added, concentrate PH is fine-tuning to 12, make heavy metal ion in alkali
Property under the conditions of precipitate, precipitation separation after, take supernatant；Wherein, buck adds speed and is：1.0ml/min；Sodium hydroxide solution is thrown
Acceleration is：0.2ml/min.
Step 4, supernatant is again 10% dilution heat of sulfuric acid regulation PH to 7 with mass fraction, then, from bottom to top, is adopted
Anoxic BAF processing units are passed through with 3m/h filtering velocitys with up flow type；Filtrate used in anoxic BAF processing units is haydite, particle diameter 3mm；
Sewage after anoxic BAF processing unit processes uses up flow type through intermediate pool, handles single by aerobic BAF with 3m/h filtering velocitys
Member；Wherein, filtrate used in aerobic BAF processing units is haydite, and particle diameter 3mm, Aerobic Pond aeration tube is separately provided with gas backwash tube,
Aeration uses air diffuser with sing-hole membranes, is arranged on cobble supporting layer, the position under ceramic grain filter；Aerobic BAF processing
Unit water part is back to the water inlet end of anoxic BAF processing units, and reflux ratio is 150%；Aerobic BAF processing units are individually set
Intake pump；The water inlet end of anoxic BAF processing units, which is set, can add the delivery pump of carbon source, when carbon source is not enough, add extra carbon
Source；
Step 5, in the BAF processing through step 4, removal sewage after COD, ammonia nitrogen and total nitrogen, Fenton oxidation pond is flowed to, is carried out
Two grades of Fenton's reactions；Wherein, the process of two grades of Fenton's reactions is：Under stirring, seven water sulfuric acid are added simultaneously to Fenton oxidation pond sub-
Iron and H2O2；Wherein, 1g concentrates COD adds 0.005-0.02mol/L Fe2+；1g concentrates COD adds 0.02-0.04mol
H2O2；Stirring reaction 2h；Wherein, ferrous sulfate heptahydrate and H2O2The speed that adds be：3ml/min.
Step 6, the concentrate after two grades of Fenton's reactions, its PH is acidity, using 100g/L sodium hydroxide solutions, will
Concentrate PH is transferred to 7；Then, PAM is added, after precipitation separation, supernatant indices meet discharge standard, discharge.
Embodiment two：
Step 1, for needing processed percolate film-filter concentration liquid, under stirring, mass fraction is used for 10%
Dilution heat of sulfuric acid regulation concentrate pH to 5.5；
Step 2, one-level Fenton's reaction, including：Regulation pH after concentrate flow to Fenton oxidation pond, under stirring, first to
Fenton oxidation pond adds ferrous sulfate heptahydrate, and its chemical feeding quantity is：1g concentrates COD adds 0.005-0.02mol/L Fe2+；
After the completion of ferrous sulfate heptahydrate is added, H is added2O2, its chemical feeding quantity is：1g concentrates COD adds 0.02-0.04mol H2O2；
Then, stirring reaction 2-4h；Wherein, ferrous sulfate heptahydrate adds speed and is：0.5ml/min；H2O2Adding speed is：3ml/
min。
Step 3, the concentrate after one-level Fenton's reaction, its PH is acidity, adds 100g/L limewash by concentrate
PH coarse adjustment is to 11；Then, 100g/L sodium hydroxide solutions are added, concentrate PH is fine-tuning to 12, make heavy metal ion in alkalescence
Under the conditions of precipitate, precipitation separation after, take supernatant；Wherein, buck adds speed and is：2.0ml/min；Sodium hydroxide solution is added
Speed is：0.5ml/min.
Step 4, supernatant adjusts PH to 8.5 with mass fraction for 10% dilution heat of sulfuric acid again, then, from bottom to top,
Up flow type is used to pass through anoxic BAF processing units with 1m/h filtering velocitys；Filtrate used in anoxic BAF processing units is haydite, particle diameter
5mm；Sewage after anoxic BAF processing unit processes uses up flow type through intermediate pool, with 1m/h filtering velocitys by aerobic BAF at
Manage unit；Wherein, filtrate used in aerobic BAF processing units is haydite, and particle diameter 5mm, Aerobic Pond aeration tube and gas backwash tube are independent
Set, aeration uses air diffuser with sing-hole membranes, is arranged on cobble supporting layer, the position under ceramic grain filter；Aerobic BAF
Processing unit water part is back to the water inlet end of anoxic BAF processing units, and reflux ratio is 700%；Aerobic BAF processing units list
Solely set intake pump；The water inlet end of anoxic BAF processing units, which is set, can add the delivery pump of carbon source, when carbon source is not enough, add volume
Outer carbon source；
Step 5, in the BAF processing through step 4, removal sewage after COD, ammonia nitrogen and total nitrogen, Fenton oxidation pond is flowed to, is carried out
Two grades of Fenton's reactions；Wherein, the process of two grades of Fenton's reactions is：Under stirring, seven water sulfuric acid are added simultaneously to Fenton oxidation pond sub-
Iron and H2O2；Wherein, 1g concentrates COD adds 0.005-0.02mol/L Fe2+；1g concentrates COD adds 0.02-0.04mol
H2O2；Stirring reaction 4h；Wherein, ferrous sulfate heptahydrate and H2O2The speed that adds be：2ml/min.
Step 6, the concentrate after two grades of Fenton's reactions, its PH is acidity, using 100g/L sodium hydroxide solutions, will
Concentrate PH is transferred to 8；Then, PAM is added, after precipitation separation, supernatant indices meet discharge standard, discharge.
Test example one
In Zhejiang Province, the refuse landfill of Dongyang City second carries out the processing pilot scale of percolate film-filter concentration liquid, processing rule
Mould 0.3m3/ h, this concentrate COD concentration are 4200mg/L, BOD5Concentration is 380mg/L, and ammonia nitrogen concentration 230mg/L, total nitrogen is dense
Spend 410mg/L.
Using the handling process of embodiment one, after a Fenton's reaction, COD concentration is down to 1596mg/L, and clearance is
62%；BOD5430mg/L is risen to, clearance is -13.1%；Ammonia nitrogen concentration is down to 215mg/L, clearance 6.52%；Total nitrogen is dense
Degree is down to 370mg/L, and clearance is 9.75%；After anoxic BAF and aerobic BAF, COD concentration can continue to be down to 483mg/L, go
Except rate is 69.7%；BOD5Concentration is down to 84mg/L, clearance 80.4%；Ammonia nitrogen is down to 14mg/L, and clearance 93.4% passes through
Add total nitrogen concentration after carbon source, reaction and be down to 130mg/L, nitrogen removal rate 64.8%；Carry out secondary Fenton again to BAF water outlets anti-
Ying Hou, COD concentration can be down to 290mg/L, clearance 55.1%；BOD5Concentration is down to 76mg/L, clearance 9.52%；Ammonia nitrogen is dense
Spend for 13mg/L, clearance 7.14%；Total nitrogen concentration is 121mg/L, and clearance is 6.92%；It is total that concentrate water accounts for percolate
The 25% of amount, NF membrane effluent COD concentration is less than 50mg/L, and the concentrate after processing is mixed with NF membrane water outlet, blended again
Water COD is 78mg/L, BOD5Concentration is 21mg/L, and ammonia nitrogen concentration 3.3mg/L, total nitrogen concentration is 30.5mg/L, meets discharge mark
Alignment request.
This concentrate is handled using the handling process of embodiment two, result of the test and embodiment described above
The effect of one handling process is similar, and the concentrate after processing is mixed with NF membrane water outlet again, and mixing water outlet COD is 65mg/
L, BOD5Concentration is 18mg/L, and ammonia nitrogen concentration 2.3mg/L, total nitrogen concentration is 28.5mg/L, meets discharge standard requirement.
Test example two
Using the handling process of embodiment one, only change the order of adding of step 2 and add speed, other process steps are not
Become, the processing of percolate film-filter concentration liquid is carried out to the refuse landfill of Zhejiang Province's Dongyang City second.Four experiments are carried out altogether：
Experiment 1：In step 2, ferrous sulfate heptahydrate is added to Fenton oxidation pond with 0.2ml/min speed；Then, with
4ml/min speed adds H to Fenton oxidation pond2O2.I.e.：Technique with embodiment one is identical.
Experiment 2：In step 2, H is added to Fenton oxidation pond with 4ml/min speed first2O2；Then, then with 0.2ml/
Min speed adds ferrous sulfate heptahydrate to Fenton oxidation pond.
Experiment 3：In step 2, ferrous sulfate heptahydrate is added to Fenton oxidation pond with 4ml/min speed；Then, with
0.2ml/min speed adds H to Fenton oxidation pond2O2.I.e.：Technique with embodiment one is identical.
Experiment 4：In step 2, H is added to Fenton oxidation pond with 0.2ml/min speed first2O2；Then, then with 4ml/
Min speed adds ferrous sulfate heptahydrate to Fenton oxidation pond.
After 4 experiments, effluent index see the table below：
By upper table as can be seen that using the technique of the present invention, effluent index is optimal.Thus prove to carry out one in step 2
During level Fenton's reaction, ferrous sulfate heptahydrate and H2O2Add speed and order of adding, aobvious is influenceed on the effluent index that finally gives
Write.
Test example three
Using the handling process of embodiment one, only change step 3, other process steps are constant, to Zhejiang Province's Dongyang City the
Two refuse landfills carry out the processing of percolate film-filter concentration liquid.Tested twice altogether：
Experiment 1：100g/L limewash is added by concentrate PH coarse adjustment to 11；Then, 100g/L sodium hydroxide solutions are added,
Concentrate PH is fine-tuning to 12；Wherein, limewash adds speed and is：2.0ml/min；Sodium hydroxide solution adds speed：
0.5ml/min。
Experiment 2：100g/L sodium hydroxide solutions are added, concentrate PH is transferred to 12；Wherein, sodium hydroxide solution adds speed
Spend and be：0.5ml/min.
After 2 experiments, effluent index see the table below：
By upper table as can be seen that using the technique of the present invention, effluent index is optimal.Thus prove to adjust PH to sink in step 3
During shallow lake, the effect of feeding lime water is better than the effect for only adding sodium hydroxide solution.
Described above is only the preferred embodiment of the present invention, it is noted that for the ordinary skill people of the art
For member, under the premise without departing from the principles of the invention, some improvements and modifications can also be made, these improvements and modifications also should
Depending on protection scope of the present invention.
Claims (4)
1. a kind of processing method to percolate film-filter concentration liquid, it is characterised in that comprise the following steps：
Step 1, for needing processed percolate film-filter concentration liquid, under stirring, use mass fraction for 10% it is dilute
Sulfuric acid solution adjusts concentrate pH to 4-5.5；
Step 2, one-level Fenton's reaction, including：Concentrate after regulation pH flows to Fenton oxidation pond, under stirring, first to Fenton
Oxidation pond adds ferrous sulfate heptahydrate, and its chemical feeding quantity is：1g concentrates COD adds 0.005-0.02mol/L Fe2+；In seven water
After the completion of ferrous sulfate is added, H is added2O2, its chemical feeding quantity is：1g concentrates COD adds 0.02-0.04mol H2O2；Then,
Stirring reaction 2-4h；
Step 3, the concentrate after one-level Fenton's reaction, its PH is acidity, adds 100g/L limewash concentrate PH is thick
It is transferred to 10.5 to 11；Then, 100g/L sodium hydroxide solutions are added, concentrate PH is fine-tuning to 12, make heavy metal ion in alkali
Property under the conditions of precipitate, precipitation separation after, take supernatant；
Step 4, supernatant is again 10% dilution heat of sulfuric acid regulation PH to 7-8.5 with mass fraction, then, from bottom to top, is adopted
Anoxic BAF processing units are passed through with 1-3m/h filtering velocitys with up flow type；Filtrate used in anoxic BAF processing units is haydite, particle diameter 3-
5mm；Sewage after anoxic BAF processing unit processes uses up flow type through intermediate pool, and aerobic BAF is passed through with 1-3m/h filtering velocitys
Processing unit；Wherein, filtrate used in aerobic BAF processing units is haydite, particle diameter 3-5mm, Aerobic Pond aeration tube and gas backwash tube
It is separately provided, aeration uses air diffuser with sing-hole membranes, is arranged on cobble supporting layer, the position under ceramic grain filter；It is good
Oxygen BAF processing units water part is back to the water inlet end of anoxic BAF processing units, and reflux ratio is 150%-700%；It is aerobic
BAF processing units individually set intake pump；The water inlet end of anoxic BAF processing units, which is set, can add the delivery pump of carbon source, in carbon source
When not enough, Additional carbon sources are added；
Step 5, in the BAF processing through step 4, removal sewage after COD, ammonia nitrogen and total nitrogen, Fenton oxidation pond is flowed to, two grades are carried out
Fenton's reaction；Wherein, the process of two grades of Fenton's reactions is：Under stirring, to Fenton oxidation pond simultaneously add ferrous sulfate heptahydrate and
H2O2；Wherein, 1g concentrates COD adds 0.005-0.02mol/L Fe2+；1g concentrates COD adds 0.02-0.04mol's
H2O2；Stirring reaction 2-4h；
Step 6, the concentrate after two grades of Fenton's reactions, its PH is acidity, using 100g/L sodium hydroxide solutions, will be concentrated
Liquid PH is transferred to 7-8；Then, PAM is added, after precipitation separation, supernatant indices meet discharge standard, discharge.
2. the processing method according to claim 1 to percolate film-filter concentration liquid, it is characterised in that in step 2,
Ferrous sulfate heptahydrate adds speed：0.2-0.5ml/min；H2O2Adding speed is：3-4ml/min.
3. the processing method according to claim 1 to percolate film-filter concentration liquid, it is characterised in that in step 3,
Limewash adds speed：1.0-2.0ml/min；Sodium hydroxide solution adds speed：0.2-0.5ml/min.
4. the processing method according to claim 1 to percolate film-filter concentration liquid, it is characterised in that in step 5,
Ferrous sulfate heptahydrate and H2O2The speed that adds be：2-3ml/min.
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